GB2197155B - Halftone image reproduction - Google Patents
Halftone image reproductionInfo
- Publication number
- GB2197155B GB2197155B GB8724167A GB8724167A GB2197155B GB 2197155 B GB2197155 B GB 2197155B GB 8724167 A GB8724167 A GB 8724167A GB 8724167 A GB8724167 A GB 8724167A GB 2197155 B GB2197155 B GB 2197155B
- Authority
- GB
- United Kingdom
- Prior art keywords
- image reproduction
- halftone image
- halftone
- reproduction
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
- Dot-Matrix Printers And Others (AREA)
- Color, Gradation (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/919,521 US4730221A (en) | 1986-10-16 | 1986-10-16 | Screening techniques by identification of constant grey components |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8724167D0 GB8724167D0 (en) | 1987-11-18 |
GB2197155A GB2197155A (en) | 1988-05-11 |
GB2197155B true GB2197155B (en) | 1991-04-03 |
Family
ID=25442237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8724167A Expired - Fee Related GB2197155B (en) | 1986-10-16 | 1987-10-15 | Halftone image reproduction |
Country Status (4)
Country | Link |
---|---|
US (1) | US4730221A (en) |
JP (1) | JPS63107368A (en) |
CA (1) | CA1311421C (en) |
GB (1) | GB2197155B (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8501845A (en) * | 1985-06-27 | 1987-01-16 | Oce Nederland B V Patents And | METHOD FOR ENLARGING / REDUCING DITHER IMAGES. |
US4841377A (en) * | 1986-06-14 | 1989-06-20 | Konishiroku Photo Industry Co., Ltd. | Continuous image estimation method |
US4942480A (en) * | 1988-09-06 | 1990-07-17 | Nynex Corporation | Reproduction of halftone original with moire reduction and tone adjustment |
US4965599A (en) * | 1989-11-13 | 1990-10-23 | Eastman Kodak Company | Scanning apparatus for halftone image screen writing |
US5187594A (en) * | 1990-02-09 | 1993-02-16 | Graphic Edge, Inc. | Method of creating and applying half tone screen patterns |
US5341228A (en) * | 1990-12-04 | 1994-08-23 | Research Corporation Technologies | Method and apparatus for halftone rendering of a gray scale image using a blue noise mask |
JP3276985B2 (en) * | 1991-06-27 | 2002-04-22 | ゼロックス・コーポレーション | Image pixel processing method |
US5341224A (en) * | 1992-04-17 | 1994-08-23 | Xerox Corporation | Image processing system and method for employing adaptive scanning of halftones to provide better printable images |
US5278670A (en) * | 1992-12-18 | 1994-01-11 | Xerox Corporation | Content-based resolution conversion of color documents |
US5341226A (en) * | 1993-04-22 | 1994-08-23 | Xerox Corporation | Automatic image segmentation for color documents |
US5327262A (en) * | 1993-05-24 | 1994-07-05 | Xerox Corporation | Automatic image segmentation with smoothing |
US5339172A (en) * | 1993-06-11 | 1994-08-16 | Xerox Corporation | Apparatus and method for segmenting an input image in one of a plurality of modes |
US5523849A (en) * | 1993-06-17 | 1996-06-04 | Eastman Kodak Company | Optimizing edge enhancement for electrographic color prints |
US6549656B1 (en) | 1993-11-29 | 2003-04-15 | Xerox Corporation | Fuzzy image segmentation |
US6002493A (en) * | 1993-12-13 | 1999-12-14 | Case; Robert M. | Method for reproducing an image |
US20020146171A1 (en) * | 2000-10-01 | 2002-10-10 | Applied Science Fiction, Inc. | Method, apparatus and system for black segment detection |
CN100361486C (en) * | 2003-03-17 | 2008-01-09 | 宇东科技股份有限公司 | Image correcting method |
TWI368116B (en) * | 2007-04-04 | 2012-07-11 | Primax Electronics Ltd | Method for generating basic template utilized to form screening mask |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4051536A (en) * | 1975-03-14 | 1977-09-27 | Xerox Corporation | Electronic halftone imaging system |
US4210936A (en) * | 1977-12-27 | 1980-07-01 | Pitney Bowes Inc. | Method and apparatus for reproducing an original gray scale image |
-
1986
- 1986-10-16 US US06/919,521 patent/US4730221A/en not_active Expired - Lifetime
-
1987
- 1987-08-24 CA CA000545135A patent/CA1311421C/en not_active Expired - Fee Related
- 1987-10-08 JP JP62252642A patent/JPS63107368A/en active Pending
- 1987-10-15 GB GB8724167A patent/GB2197155B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA1311421C (en) | 1992-12-15 |
JPS63107368A (en) | 1988-05-12 |
GB2197155A (en) | 1988-05-11 |
GB8724167D0 (en) | 1987-11-18 |
US4730221A (en) | 1988-03-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20021015 |